Interplay of Size and Magnetic Effects in Electrocatalytic Water Oxidation Activity of Sub-10 nm NiO x Supported Porous Hard-Carbons.

Autor: Yadav S; Department of Chemistry, Indian Institute of Technology Bombay, Mumbai Maharashtra, 400076, India., Baghel NS; Department of Energy Science & Engineering, Indian Institute of Technology Bombay, Mumbai Maharashtra, 400076, India., Sarkar SK; Department of Energy Science & Engineering, Indian Institute of Technology Bombay, Mumbai Maharashtra, 400076, India., Subramaniam C; Department of Chemistry, Indian Institute of Technology Bombay, Mumbai Maharashtra, 400076, India.
Jazyk: angličtina
Zdroj: Chemistry, an Asian journal [Chem Asian J] 2024 Oct 01; Vol. 19 (19), pp. e202400631. Date of Electronic Publication: 2024 Sep 12.
DOI: 10.1002/asia.202400631
Abstrakt: This report describes a systematic approach for precise engineering of a catalyst-metal oxide interface through combining complementary approaches of chemical vapor deposition and atomic layer deposition. Specifically, Chemical Vapor Deposition (CVD) fabricated nanostructured hard-carbon framework (NCF) is employed as synergistic support for precise deposition of NiO x particles through Atomic Layer Deposition (ALD). The three variants of NCF-NiO x system (dimensions ranging from 3-12 nm, surface coverage ranging from 0.14 %-2 %) achieved exhibit unique electrocatalytic water oxidation activities, that are further strongly influenced by an external magnetic field (H ext ). This confluence of size engineering and associated magnetic field effects interplay to produce the largest lowering in R ct at H ext =200 mT. A comprehensive analysis of electrocatalytic parameters including the Tafel slope and double layer capacitance establishes further insights on co-relation of size effect and magnetic properties to understand the role of nanocarbon supported transition metal oxides in water electrolysis.
(© 2024 Wiley-VCH GmbH.)
Databáze: MEDLINE
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